121. a. Within 30 days after the adoption of one of said optional plans, the district commissioners shall make and file their report and certificate over at least three of their signatures setting forth and properly describing the district boundaries fixed and determined, to which there shall be annexed a map of the county with the district boundaries clearly marked thereon.
The report so certified shall be filed in the office of the clerk of the county, and a copy thereof shall also be filed with the Secretary of State.
b. In addition to the description of the district boundaries and map required to be filed with the Secretary of State under subsection a. of this section, the district commissioners shall file with the Secretary of State the district boundaries in ESRI Shapefile format in accordance with section 1 of P.L.2019, c.487 (C.19:4-18).